Javascript reference syntax

The following reference is valid for all browsers.

        <pre data-sub="prettyprint:_">
        <script src="f_onload.js" type="text/javascript" language="javascript"></script>
        </pre>

        <p>
        The following reference is valid for firefox, but not valid in IE
        </p>

        <pre data-sub="prettyprint:_">
        <script src="f_onload.js" type="text/javascript" language="javascript" />
        </pre>